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Vitasovic T, Caniglia G, Eghtesadi N, Ceccato M, Bo Jesen ED, Gosewinkel U, Neusser G, Rupp U, Walther P, Kranz C, Ferapontova EE. Antibacterial Action of Zn 2+ Ions Driven by the In Vivo Formed ZnO Nanoparticles. ACS APPLIED MATERIALS & INTERFACES 2024; 16:30847-30859. [PMID: 38853353 DOI: 10.1021/acsami.4c04682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2024]
Abstract
Antibacterial formulations based on zinc oxide nanoparticles (ZnO NPs) are widely used for antibiotic replacement in veterinary medicine and animal nutrition. However, the undesired environmental impact of ZnO NPs triggers a search for alternative, environmentally safer solutions. Here, we show that Zn2+ in its ionic form is a more eco-friendly antibacterial, and its biocidal action rivals that of ZnO NPs (<100 nm size), with a minimal biocidal concentration being 41(82) μg mL-1 vs 5 μg mL-1 of ZnO NPs, as determined for 103(106) CFU mL-1 E. coli. We demonstrate that the biocidal activity of Zn2+ ions is primarily associated with their uptake by E. coli and spontaneous in vivo transformation into insoluble ZnO nanocomposites at an internal bacterial pH of 7.7. Formed in vivo nanocomposite then damages E. coli membrane and intracellular components from the inside, by forming insoluble biocomposites, whose formation can also trigger ZnO characteristic reactions damaging the cells (e.g., by generation of high-potential reactive oxygen species). Our study defines a special route in which Zn2+ metal ions induce the death of bacterial cells, which might be common to other metal ions capable of forming semiconductor oxides and insoluble hydroxides at a slightly alkaline intracellular pH of some bacteria.
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Affiliation(s)
- Toni Vitasovic
- Interdisciplinary Nanoscience Center (iNANO), Faculty of Natural Sciences, Aarhus University, Gustav Wieds Vej 1590-14, 8000 Aarhus C, Denmark
- Aarhus University Center for Water Technology (WATEC), Aarhus University, Ny Munkegade 120, 8000 Aarhus C, Denmark
| | - Giada Caniglia
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert Einstein Allee 11, 89081 Ulm, Germany
| | - Neda Eghtesadi
- Interdisciplinary Nanoscience Center (iNANO), Faculty of Natural Sciences, Aarhus University, Gustav Wieds Vej 1590-14, 8000 Aarhus C, Denmark
- Chemical Engineering Department, Nazarbayev University, 53 Kabanbay Batyr Avenue, Nur-Sultan 01000, Kazakhstan
| | - Marcel Ceccato
- Interdisciplinary Nanoscience Center (iNANO), Faculty of Natural Sciences, Aarhus University, Gustav Wieds Vej 1590-14, 8000 Aarhus C, Denmark
| | - Espen Drath Bo Jesen
- Interdisciplinary Nanoscience Center (iNANO), Faculty of Natural Sciences, Aarhus University, Gustav Wieds Vej 1590-14, 8000 Aarhus C, Denmark
| | - Ulrich Gosewinkel
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399, DK-4000 Roskilde, Denmark
| | - Gregor Neusser
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert Einstein Allee 11, 89081 Ulm, Germany
| | - Ulrich Rupp
- Central Facility for Electron Microscopy, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Paul Walther
- Central Facility for Electron Microscopy, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Christine Kranz
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert Einstein Allee 11, 89081 Ulm, Germany
| | - Elena E Ferapontova
- Interdisciplinary Nanoscience Center (iNANO), Faculty of Natural Sciences, Aarhus University, Gustav Wieds Vej 1590-14, 8000 Aarhus C, Denmark
- Aarhus University Center for Water Technology (WATEC), Aarhus University, Ny Munkegade 120, 8000 Aarhus C, Denmark
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Cai L, Huang X, Feng H, Fan G, Sun X. Antimicrobial mechanisms of g-C 3 N 4 @ZnO against oomycetes Phytophthora capsici: from its metabolism, membrane structures and growth. PEST MANAGEMENT SCIENCE 2024; 80:2096-2108. [PMID: 38135506 DOI: 10.1002/ps.7946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Revised: 11/25/2023] [Accepted: 12/23/2023] [Indexed: 12/24/2023]
Abstract
BACKGROUND Phytophthora capsici, a refractory and model oomycete plant pathogen, especially threatens multiple vegetable crops. A limited number of chemical pesticides play a vital role in controlling oomycete plant diseases. However, this approach often leads to excessive use of chemical agent, exacerbates environmental issues and more and more drug-resistant strains of oomycete. Therefore, it is imperative to devise innovative solutions that can effectively address the infection of oomycete while maintaining high levels of environmental sustainability and low toxicity. RESULTS In this study, g-C3 N4 @ZnO heterostructure was synthesized and characterized. The g-C3 N4 @ZnO showed higher toxicity on Phytophthora capsici than graphitic carbon nitride (g-C3 N4 ) nanosheets and zinc oxide (ZnO) nanoparticles in vitro and in vivo. Except the hyphal growth of Phytophthora capsici, their germination rate of spores, sporangium formation and number of spores were all suppressed by g-C3 N4 @ZnO heterostructure. Furthermore, we found that this g-C3 N4 @ZnO heterostructure has higher photocatalytic activity under visible light, which potentially enhanced the reactive oxygen species (ROS) mediated stress on Phytophthora capsici. Ultrastructural morphology, global changes of gene expression and weighted gene co-expression network analysis all supported that the anti-oomycete activity of g-C3 N4 @ZnO was manifested in the destruction of membrane system and inhibition of multiple metabolisms of Phytophthora capsici under visible irradiation, which also could be attributed to the ROS and zinc ion (Zn2+ ) mediated stress. CONCLUSION This works offers a novel oomycete disease management strategy by using g-C3 N4 @ZnO, which were attributed to the ROS stress, destruction of membrane system and inhibition of multiple metabolisms. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Lin Cai
- Guizhou Key Laboratory for Tobacco Quality, College of Tobacco Science of Guizhou University, Guiyang, China
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang, China
| | - Xunliang Huang
- National Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Center for R&D of Fine Chemicals of Guizhou University, Guiyang, China
| | - Hui Feng
- Guizhou Key Laboratory for Tobacco Quality, College of Tobacco Science of Guizhou University, Guiyang, China
| | - Guangjin Fan
- College of Plant Protection, Southwest University, Chongqing, China
| | - Xianchao Sun
- College of Plant Protection, Southwest University, Chongqing, China
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Aminzade R, Ramezanian A, Eshghi S, Hosseini SMH. The potential of postharvest zinc treatment for preservation of pomegranate aril quality. Sci Rep 2024; 14:1067. [PMID: 38212358 PMCID: PMC10784503 DOI: 10.1038/s41598-024-51437-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2023] [Accepted: 01/04/2024] [Indexed: 01/13/2024] Open
Abstract
A short shelf life usually limits the distribution and supply of pomegranate arils. Since zinc (Zn) has an indispensable role in the nutrient integrity of our diet and is effective in suppressing pathogens, this study was done as two separate experiments of pre-harvest spraying and postharvest dipping of arils with two zinc supplements, including nano zinc oxide (nZnO) and zinc sulfate (ZnSO4). The optimized concentration of both sources was used in the experiment. The pre-harvest treatment failed to extend the shelf life of arils, and, ultimately, the arils decayed after 15 days. However, the postharvest zinc treatment significantly (P < 0.01) affected all measured indices. Also, zinc sulfate was more effective than nZnO. Zn uptake was higher in postharvest treatments because exogenous Zn was in direct contact with the aril surface. After dissolving in water, Zn ions in sulfate bind to the membrane of microorganisms and thus delay cell division and microbial growth cycle. The solubility of zinc oxide nanoparticles in water is poor. Using the ZnSO4 treatment (0.8%W/V) effectively maintained the values of titratable acidity (TA), total phenolic content (TPC), total soluble solids (TSS), anthocyanin content, and antioxidant activity. Also, this treatment significantly controlled weight loss in the arils.
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Affiliation(s)
- Reihaneh Aminzade
- Department of Horticultural Science, School of Agriculture, Shiraz University, Shiraz, Iran
| | - Asghar Ramezanian
- Department of Horticultural Science, School of Agriculture, Shiraz University, Shiraz, Iran.
| | - Saeid Eshghi
- Department of Horticultural Science, School of Agriculture, Shiraz University, Shiraz, Iran
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Noach N, Lavy E, Reifen R, Friedman M, Kirmayer D, Zelinger E, Ritter A, Yaniv D, Reifen E. Zinc chloride is effective as an antibiotic in biofilm prevention following septoplasty. Sci Rep 2023; 13:8344. [PMID: 37221180 DOI: 10.1038/s41598-023-35069-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Accepted: 05/11/2023] [Indexed: 05/25/2023] Open
Abstract
Biofilm-state bacterial infections associated with inserted medical devices constitute a massive health and financial problem worldwide. Although bacteria exhibit significantly lower susceptibility to antibiotics in the biofilm state, the most common treatment approach still relies on antibiotics, exacerbating the phenomenon of antibiotic-resistant bacteria. In this study, we aimed to assess whether ZnCl2 coating of intranasal silicone splints (ISSs) can reduce the biofilm infections associated with the insertion of these devices and prevent the overuse of antibiotics while minimizing waste, pollution and costs. We tested the ability of ZnCl2 to prevent biofilm formation on ISS both in vitro and in vivo by using the microtiter dish biofilm formation assay, crystal violet staining, and electron and confocal microscopy. We found a significant decrease in biofilm formation between the treatment group and the growth control when ZnCl2-coated splints were placed in patients' nasal flora. According to these results, infections associated with ISS insertion may be prevented by using ZnCl2 coating, thereby obviating the overuse and abuse of antibiotics.
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Affiliation(s)
- Noa Noach
- The Institute of Biochemistry, Food Science and Nutrition. The Robert H. Smith Faculty of Agriculture, Food & Environment, The Hebrew University of Jerusalem, Rehovot, Israel
| | - Eran Lavy
- The Koret School of Veterinary Medicine. The Robert H. Smith Faculty of Agriculture, Food & Environment, The Hebrew University of Jerusalem, Rehovot, Israel
| | - Ram Reifen
- The Institute of Biochemistry, Food Science and Nutrition. The Robert H. Smith Faculty of Agriculture, Food & Environment, The Hebrew University of Jerusalem, Rehovot, Israel.
| | - Michael Friedman
- The School of Pharmacy, The Faculty of Medicine, Ein Kerem Campus, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - David Kirmayer
- The School of Pharmacy, The Faculty of Medicine, Ein Kerem Campus, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Einat Zelinger
- FACSI-Faculty of Agriculture Center for Scientific Imaging. The Robert H. Smith Faculty of Agriculture, Food & Environment, The Hebrew University of Jerusalem, Rehovot, Israel
| | - Amit Ritter
- Department of Otolaryngology, Head and Neck Surgery, Rabin Medical Center, Petah Tikva, Israel
| | - Dan Yaniv
- Department of Otolaryngology, Head and Neck Surgery, Rabin Medical Center, Petah Tikva, Israel
| | - Ella Reifen
- Department of Otolaryngology, Head and Neck Surgery, Rabin Medical Center, Petah Tikva, Israel
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Coverdale JPC, van den Berg HA, Khazaipoul S, Bridgewater HE, Stewart AJ, Blindauer CA. Albumin-mediated extracellular zinc speciation drives cellular zinc uptake. Chem Commun (Camb) 2022; 58:7384-7387. [PMID: 35695483 PMCID: PMC9244874 DOI: 10.1039/d2cc02278h] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The role of the extracellular medium in influencing metal uptake into cells has not been described quantitatively. In a chemically-defined model system containing albumin, zinc influx into endothelial cells correlates with the extracellular free zinc concentration. Allosteric inhibition of zinc-binding to albumin by free fatty acids increased zinc flux. Fatty acids alter zinc speciation in plasma, increasing zinc influx into endothelial cells.![]()
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Affiliation(s)
- James P C Coverdale
- Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK. .,School of Pharmacy, Institute of Clinical Sciences, University of Birmingham, Edgbaston, B15 2TT, UK
| | | | - Siavash Khazaipoul
- School of Medicine, University of St. Andrews, St. Andrews, KY16 9TF, UK
| | | | - Alan J Stewart
- School of Medicine, University of St. Andrews, St. Andrews, KY16 9TF, UK
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Popick H, Brinkmann M, McPhedran K. Assessment of stormwater discharge contamination and toxicity for a cold-climate urban landscape. ENVIRONMENTAL SCIENCES EUROPE 2022; 34:43. [PMID: 35582663 PMCID: PMC9106602 DOI: 10.1186/s12302-022-00619-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Accepted: 04/04/2022] [Indexed: 06/01/2023]
Abstract
BACKGROUND Stormwater is water resulting from precipitation events and snowmelt running off the urban landscape, collecting in storm sewers, and typically being released into receiving water bodies through outfalls with minimal to no treatment. Despite a growing body of evidence observing its deleterious pollution impacts, stormwater management and treatment in cold climates remains limited, partly due to a lack of quality and loading data and modeling parameters. This study examines the quality of stormwater discharging during the summer season in a cold-climate, semi-arid Canadian city (Saskatoon, Saskatchewan). RESULTS Seven stormwater outfalls with mixed-land-use urban catchments > 100 km2 were sampled for four summer (June-August 2019) storm events and analyzed for a suite of quality parameters, including total suspended solids (TSS), chemical oxygen demand (COD), dissolved organic carbon (DOC), metals, and targeted polyaromatic hydrocarbons (PAHs). In addition, assessment of stormwater toxicity was done using the two toxicity assays Raphidocelis subcapitata (algae) and Vibrio fischeri (bacteria). Notable single-event, single-outfall contaminant pulses included of arsenic (420 µg/L), cadmium (16.4 µg/L), zinc (924 µg/L), fluorene (4.95 µg/L), benzo[a]pyrene (0.949 µg/L), pyrene (0.934 µg/L), phenanthrene (1.39 µg/L), and anthracene (1.40 µg/L). The IC50 in both R. subcapitata and V. fischeri was observed, if at all, above expected toxicity thresholds for individual contaminant species. Principal component analysis (PCA) showed no clear trends for individual sampling sites or sampling dates. In contrast, parameters were correlated with each other in groups including DOC, COD, TSS, and reduced algal toxicity; and total dissolved solids (TDS), sum of metals, and pH. CONCLUSIONS In general, stormwater characteristics were similar to those of previous studies, with a bulk of contamination carried by the first volume of runoff, influenced by a combination of rainfall depth, antecedent dry period, land use, and activity within the catchment. Roads, highways, and industrial areas contribute the bulk of estimated contaminant loadings. More intensive sampling strategies are necessary to contextualize stormwater data in the context of contaminant and runoff volume peaks. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1186/s12302-022-00619-x.
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Affiliation(s)
- H. Popick
- Department of Civil, Geological, and Environmental Engineering, College of Engineering, University of Saskatchewan, Saskatoon, SK Canada
| | - M. Brinkmann
- Global Institute for Water Security, University of Saskatchewan, Saskatoon, SK Canada
- School of Environment and Sustainability, University of Saskatchewan, Saskatoon, SK Canada
- Toxicology Centre, University of Saskatchewan, Saskatoon, SK Canada
- Centre for Hydrology, University of Saskatchewan, Saskatoon, SK Canada
| | - Kerry McPhedran
- Department of Civil, Geological, and Environmental Engineering, College of Engineering, University of Saskatchewan, Saskatoon, SK Canada
- Global Institute for Water Security, University of Saskatchewan, Saskatoon, SK Canada
- University of Saskatchewan, RM 1A13, Engineering Building, 57 Campus Dr. Saskatoon, Saskatoon, SK S7N 5A9 Canada
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7
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Popick H, Brinkmann M, McPhedran K. Traffic-derived contaminant loading in snow storage facilities during spring melt. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:27875-27893. [PMID: 34984614 DOI: 10.1007/s11356-021-18340-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Accepted: 12/21/2021] [Indexed: 06/14/2023]
Abstract
Stormwater results from precipitation events and melting snow running off urban landscapes and typically being released into receiving water bodies with little to no treatment. Despite evidence of its deleterious impacts, snowmelt (SM) management and treatment are limited, partly due to a lack of quality and loading data. This study examines snowmelt quality during the spring for a cold climate, semi-arid Canadian city (Saskatoon, Saskatchewan). Four snow storage facilities receiving urban snow plowed from roads in mixed land use urban catchments (228 km2) were sampled including snow piles (five events) and SM (twelve events) runoff in 2019 and 2020. Samples were analyzed for pH, EC, TDS, TSS, COD, DOC, metals, chloride, PAHs, and Raphidocelis subcapitata and Vibrio fischeri toxicity. Notable event-specific TSS spikes occurred on April 13, 2019 (3,513 mg/L), and April 24, 2019 (3,838 mg/L), and TDS, chloride, and manganese on March 26, 2020 (15,000 mg/L, 5,800 mg/L, 574 mg/L), April 17, 2020 (5,200 mg/L, 2,600 mg/L, 882 mg/L), and April 23, 2020 (5,110 mg/L, 2,900 mg/L, 919 mg/L), though chloride remained elevated through May 1, 2020, samples (1,000 mg/L). Additionally, at two sites sampled April 13, 2019, pulses of aluminum (401 mg/L) and PAHs (pyrene, phenanthrene, anthracene; 71 µg/L, 317 µg/L, 182 µg/L) were detected. Concentrations of fluorene, benzo[a]pyrene, pyrene, phenanthrene, and anthracene in almost all SP samples exceeded national aquatic toxicity guideline thresholds, while 50% of SM samples exceeded guideline thresholds for benzo[a]pyrene and pyrene, and almost all exceeded the threshold for anthracene. Nevertheless, the EC50 for R. subcapitata and V. fischeri was observed, if at all, above expected toxicity thresholds.
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Affiliation(s)
- Hayley Popick
- Department of Civil, Geological, and Environmental Engineering, College of Engineering, University of Saskatchewan, RM 1A13, Engineering Building, 57 Campus Dr. Saskatoon, Saskatoon, SK, S7N 5A9, Canada
| | - Markus Brinkmann
- Global Institute for Water Security, University of Saskatchewan, Saskatoon, SK, Canada
- School of Environment and Sustainability, University of Saskatchewan, Saskatoon, SK, Canada
- Toxicology Centre, University of Saskatchewan, Saskatoon, SK, Canada
- Centre for Hydrology, University of Saskatchewan, Saskatoon, SK, Canada
| | - Kerry McPhedran
- Department of Civil, Geological, and Environmental Engineering, College of Engineering, University of Saskatchewan, RM 1A13, Engineering Building, 57 Campus Dr. Saskatoon, Saskatoon, SK, S7N 5A9, Canada.
- Global Institute for Water Security, University of Saskatchewan, Saskatoon, SK, Canada.
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Pillai SB, Wilcox RJ, Hillis BG, Losey BP, Martin JD. Understanding the Water-in-Salt to Salt-in-Water Characteristics across the Zinc Chloride : Water Phase Diagram. J Phys Chem B 2022; 126:2265-2278. [PMID: 35139641 DOI: 10.1021/acs.jpcb.1c10530] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Using a series of time- and temperature-resolved synchrotron diffraction experiments, the relationship between multiple polymorphs of ZnCl2 and its respective hydrates is established. The δ-phase is found to be the pure anhydrous phase, while the α, β, and γ phases result from partial hydration. Diffraction, gravimetric, and calorimetric measurements across the entire ZnCl2·R H2O, 0 > R > ∞ composition range using ultrapure, doubly sublimed ZnCl2 establish the ZnCl2 : H2O phase diagram. The results are consistent with the existence of crystalline hydrates at R = 1.33, 3, and 4.5 and identify a mechanistic pathway for hydration. All water is not removed from hydrated ZnCl2 until the system is heated above its melting point. While hydration/dehydration is reversible in concentrated solutions, dehydration from dilute aqueous solutions can result in loss of HCl, the source of hydroxide impurities commonly found in commercial ZnCl2 preparations. The strong interaction between ZnCl2 and water exerts a significant impact on the solvent water such that the system exhibits a deep eutectic at a composition of about R = 7 (87.5 mol %) and a eutectic temperature below -60 °C.
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Affiliation(s)
- Shelby B Pillai
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Robert J Wilcox
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Berkley G Hillis
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Bradley P Losey
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - James D Martin
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
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A large transposable element mediates metal resistance in the fungus Paecilomyces variotii. Curr Biol 2022; 32:937-950.e5. [PMID: 35063120 DOI: 10.1016/j.cub.2021.12.048] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 08/11/2021] [Accepted: 12/17/2021] [Indexed: 12/19/2022]
Abstract
The horizontal transfer of large gene clusters by mobile elements is a key driver of prokaryotic adaptation in response to environmental stresses. Eukaryotic microbes face similar stresses; however, a parallel role for mobile elements has not been established. A stress faced by many microorganisms is toxic metal ions in their environment. In fungi, identified mechanisms for protection against metals generally rely on genes that are dispersed within an organism's genome. Here, we discover a large (∼85 kb) region that confers tolerance to five metal/metalloid ions (arsenate, cadmium, copper, lead, and zinc) in the genomes of some, but not all, strains of a fungus, Paecilomyces variotii. We name this region HEPHAESTUS (Hφ) and present evidence that it is mobile within the P. variotii genome with features characteristic of a transposable element. HEPHAESTUS contains the greatest complement of host-beneficial genes carried by a transposable element in eukaryotes, suggesting that eukaryotic transposable elements might play a role analogous to bacteria in the horizontal transfer of large regions of host-beneficial DNA. Genes within HEPHAESTUS responsible for individual metal tolerances include those encoding a P-type ATPase transporter-PcaA-required for cadmium and lead tolerance, a transporter-ZrcA-providing tolerance to zinc, and a multicopper oxidase-McoA-conferring tolerance to copper. In addition, a subregion of Hφ confers tolerance to arsenate. The genome sequences of other fungi in the Eurotiales contain further examples of HEPHAESTUS, suggesting that it is responsible for independently assembling tolerance to a diverse array of ions, including chromium, mercury, and sodium.
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Okada M, Oshita M, Kataoka M, Azuma Y, Furuzono T. Shareability of antibacterial and osteoblastic-proliferation activities of zinc-doped hydroxyapatite nanoparticles in vitro. J Biomed Mater Res B Appl Biomater 2021; 110:799-805. [PMID: 34687486 DOI: 10.1002/jbm.b.34959] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 10/09/2021] [Accepted: 10/12/2021] [Indexed: 11/11/2022]
Abstract
Four types of zinc (Zn)-doped hydroxyapatite (Zn-HAp) nanoparticles were prepared using calcium nitrate tetrahydrate as an anti-sintering agent during calcination at 600°C for 1 hr, to prevent calcination-induced aggregation. The Zn content of the nanopowders was determined at 0, 4.3, 9.2, and 14.7% [Zn/(Ca + Zn) × 100] using inductively coupled plasma atomic emission spectroscopic analysis. Based on X-ray diffraction analysis, the products were shown to possess an apatite structure without other crystalline impurities. The cell parameters of Zn-HAp nanoparticles decreased with increasing of Zn content in the HAp structures. This tendency implies that Zn ions substituted for Ca sites in the HAp crystal lattices. To investigate the biological effects of Zn-HAp nanoparticles, cell proliferation activity of MC3T3-E1 osteoblasts and antibacterial activity against Escherichia coli were evaluated in vitro. According to the results obtained, Zn-HAp nanoparticles containing of 14.7% Zn ions was noticeable shown shareability of the conflicting activities at 0.1 mg/mL.
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Affiliation(s)
- Masanori Okada
- Department of Biological System Engineering, Graduate School of Biology-Oriented Science and Technology, Kindai University, Wakayama, Japan
| | - Mari Oshita
- Department of Biological System Engineering, Graduate School of Biology-Oriented Science and Technology, Kindai University, Wakayama, Japan
| | - Minami Kataoka
- Department of Biological System Engineering, Graduate School of Biology-Oriented Science and Technology, Kindai University, Wakayama, Japan
| | - Yoshinao Azuma
- Department of Biotechnological Science, Graduate School of Biology-Oriented Science and Technology, Kindai University, Wakayama, Japan
| | - Tsutomu Furuzono
- Department of Biological System Engineering, Graduate School of Biology-Oriented Science and Technology, Kindai University, Wakayama, Japan
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Rutherford D, Jíra J, Kolářová K, Matolínová I, Mičová J, Remeš Z, Rezek B. Growth Inhibition of Gram-Positive and Gram-Negative Bacteria by Zinc Oxide Hedgehog Particles. Int J Nanomedicine 2021; 16:3541-3554. [PMID: 34079247 PMCID: PMC8163618 DOI: 10.2147/ijn.s300428] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 04/07/2021] [Indexed: 12/11/2022] Open
Abstract
PURPOSE Nanomaterials for antimicrobial applications have gained interest in recent years due to the increasing bacteria resistance to conventional antibiotics. Wound sterilization, water treatment and surface decontamination all avail from multifunctional materials that also possess excellent antibacterial properties, eg zinc oxide (ZnO). Here, we assess and compare the effects of synthesized hedgehog-like ZnO structures and commercial ZnO particles with and without mixing on the inactivation of bacteria on surfaces and in liquid environments. METHODS Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria in microbial culture medium were added to reverse spin bioreactors that contained different concentrations of each ZnO type to enable dynamic mixing of the bacteria-ZnO suspensions. Optical density of the bacteria-ZnO suspensions was measured in real-time and the number of viable bacteria after 24 h exposure was determined using standard microbiological techniques. The concentration of zinc ion generated from ZnO dissolution in different liquid types was estimated from the dynamic interaction exposure. Static antibacterial tests without agitation in liquid media and on agar surface were performed for comparison. RESULTS A correlation between increasing ZnO particle concentration and reduction in viable bacteria was not monotonous. The lowest concentration tested (10 µg/mL) even stimulated bacteria growth. The hedgehog ZnO was significantly more antibacterial than commercial ZnO particles at higher concentrations (up to 1000 µg/mL tested), more against E. coli than S. aureus. Minimum inhibitory concentration in microwell plates was correlated with those results. No inhibition was detected for any ZnO type deposited on agar surface. Zinc ion release was greatly suppressed in cultivation media. Scanning electron microscopy images revealed that ZnO needles can pierce membrane of bacteria whereas the commercial ZnO nanoparticles rather agglomerate on the cell surface. CONCLUSION The inhibition effects are thus mainly controlled by the interaction dynamics between bacteria and ZnO, where mixing greatly enhances antibacterial efficacy of all ZnO particles. The efficacy is modulated also by ZnO particle shapes, where hedgehog ZnO has superior effect, in particular at lower concentrations. However, at too low concentrations, ZnO can stimulate bacteria growth and must be thus used with caution.
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Affiliation(s)
- David Rutherford
- Faculty of Electrical Engineering, Czech Technical University, Prague, Czech Republic
| | - Jaroslav Jíra
- Faculty of Electrical Engineering, Czech Technical University, Prague, Czech Republic
| | - Kateřina Kolářová
- Author Affiliations Institute of Physics, Czech Academy of Sciences, Prague, Czech Republic
| | - Iva Matolínová
- Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
| | - Júlia Mičová
- Institute of Chemistry, Slovak Academy of Sciences, Bratislava, Slovak Republic
| | - Zdenek Remeš
- Author Affiliations Institute of Physics, Czech Academy of Sciences, Prague, Czech Republic
| | - Bohuslav Rezek
- Faculty of Electrical Engineering, Czech Technical University, Prague, Czech Republic
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Goethe E, Gieseke A, Laarmann K, Lührs J, Goethe R. Identification and Characterization of Mycobacterium smegmatis and Mycobacterium avium subsp. paratuberculosis Zinc Transporters. J Bacteriol 2021; 203:JB.00049-21. [PMID: 33722846 PMCID: PMC8117522 DOI: 10.1128/jb.00049-21] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Accepted: 03/04/2021] [Indexed: 11/20/2022] Open
Abstract
Zinc uptake in bacteria is essential to maintain cellular homeostasis and survival. ZnuABC is an important zinc importer of numerous bacterial genera, which is expressed to restore zinc homeostasis when the cytosolic concentration decreases beyond a critical threshold. Upon zinc limitation the fast-growing nonpathogenic organism Mycobacterium smegmatis (MSMEG) as well as the ruminant pathogen M. avium subsp. paratuberculosis (MAP) increases expression of genes encoding ZnuABC homologues, but also of genes encoding other transporters. This suggests an involvement of these transporters in zinc homeostasis. Here we characterized the putative zinc transporters of MSMEG (ZnuABC and ZnuABC2) and MAP (ZnuABC, MptABC, and MAP3774-76). Deletion of either ZnuABC or ZnuABC2 in MSMEG did not lead to growth defects, but to an increased expression of zinc marker genes in MSMEGΔznuABC, indicating cytosolic zinc limitation. However, chromatin immunoprecipitation proved direct binding of the global zinc regulator Zur to promoter regions of both znuABC and znuABC2. Simultaneous deletion of both transporters caused severe growth defects, which could be restored either by homologous complementation with single ZnuABC transporters or supplementation of growth media with zinc but not iron, manganese, cobalt, or magnesium. Heterologous complementation of the double mutant with MAP transporters also resulted in reconstitution of growth. Nonradioactive FluoZinTM-3AM zinc uptake assays directly revealed the competence of all transporters to import zinc. Finally, structural and phylogenetic analyses provided evidence of a novel class of ZnuABC transporters represented by the ZnuABC2 of MSMEG, which is present only in actinobacteria, mainly in the genera Nocardia, Streptomyces and fast growing Mycobacteria IMPORTANCEZinc is necessary for bacterial growth but simultaneously toxic when in excess. Hence, bacterial cells have developed systems to alter intracellular concentration. Regulation of these systems is primarily executed at transcriptional level by regulator proteins which sense femtomolar changes in the zinc level. In environmental and pathogenic mycobacteria zinc starvation induces expression of common zinc import systems such as the ZnuABC transporter, but also of other additional not yet characterized transport systems. In this study, we characterized the role of such systems in zinc transport. We showed that transport systems of both species whose transcription is induced upon zinc starvation can exchangeably restore cellular zinc homeostasis in transporter deficient mutants by transporting zinc into the cell.
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Affiliation(s)
- Elke Goethe
- Institute for Microbiology, Department of Infectious Diseases, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Ayla Gieseke
- Institute for Microbiology, Department of Infectious Diseases, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Kristin Laarmann
- Institute for Microbiology, Department of Infectious Diseases, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Janita Lührs
- Institute for Microbiology, Department of Infectious Diseases, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Ralph Goethe
- Institute for Microbiology, Department of Infectious Diseases, University of Veterinary Medicine Hannover, Hannover, Germany
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Huang L, Zhang G, Bai J, Xia Z, Wang W, Jia J, Wang X, Liu X, Cui B. Desalinization via freshwater restoration highly improved microbial diversity, co-occurrence patterns and functions in coastal wetland soils. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 765:142769. [PMID: 33168246 DOI: 10.1016/j.scitotenv.2020.142769] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 09/28/2020] [Accepted: 09/30/2020] [Indexed: 06/11/2023]
Abstract
Saltwater intrusion has greatly impacted the functions of coastal wetland soils worldwide by increasing the salt stress; desalinization via freshwater restoration has been suggested to recover saline wetland soils and biodiversity, but its effectiveness is debated. To evaluate the desalinization effectiveness, we characterized the microbial communities and activities using high throughput 16S rRNA gene sequencing and 15N isotopic techniques in freshwater restored (≥10 years) and unrestored wetlands, and then compared the data with reported values of original freshwater wetlands in one of the most dynamic coastal areas, Yellow river estuary (YRE). Our data revealed that freshwater input significantly increased the soil organic carbon (SOC; P < 0.05) after 10 years of restoration, yet it was still 10 times lower than the reported values of original freshwater wetlands. In general, microbial community showed higher diversities and more co-occurrence interactions in the restored than unrestored wetlands. The recovered phylogenetic diversity and the relative abundance of Chloroflexi (9.8-16.3%), Actinobacteria (5.5-10%), Latescibacteria (0.5-1.5%), Nitrospirae (0.9-1.4%) were up to the similar levels of original freshwater wetlands in YRE. Specifically, Gemmatimonadetes_denitrifier clones, as the representatives of denitrifiers, were recovered up to 0.3% with 20 times higher concomitant denitrification rate than anammox rate, significantly contributing to the nitrate removal in restored wetlands; however the rate will be reduced by 80% with a short-term saltwater intrusion. Our study highlighted that freshwater input effectively improved the microbial diversity and their functions and provided a good insight into the desalinization effectiveness via freshwater restoration in coastal wetlands worldwide. ORIGINALITY-SIGNIFICANCE STATEMENT: Salinization is globally spreading with approximately one billion hectares area covered with saline and/or sodic soils on the earth, and the negative effects of salinity on soil microbial communities and their activities have been frequently reported in previous studies all around the world; however, it remains largely unknown about whether the microbial communities and their activities can be recovered or not in soil suffered salinization. Desalinization via freshwater restoration is supposed to offer a good solution to soil salinization in coastal area, but the effectiveness is debated. Here, we are presenting the long-term of field study related to the desalinization effects on microbial diversity, co-occurrence and functions, and find desalinization via freshwater restoration can recover most of microbial communities up to the similar levels of that in original freshwater wetlands, and highly improved microbial diversity and their functions, which sheds a positive light on soil desalinization via freshwater restoration at microenvironments.
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Affiliation(s)
- Laibin Huang
- School of Environment, Beijing Normal University, Beijing, China; Department of Land, Air and Water Resources, University of California-Davis, California, USA.
| | - Guangliang Zhang
- School of Environment, Beijing Normal University, Beijing, China
| | - Junhong Bai
- Shandong Key Laboratory of Eco-Environmental Science for the Yellow River Delta, Binzhou University, Binzhou 256600, China.
| | - Zhijian Xia
- School of Environment, Beijing Normal University, Beijing, China
| | - Wei Wang
- School of Environment, Beijing Normal University, Beijing, China
| | - Jia Jia
- School of Environment, Beijing Normal University, Beijing, China
| | - Xin Wang
- School of Environment, Beijing Normal University, Beijing, China
| | - Xinhui Liu
- School of Environment, Beijing Normal University, Beijing, China
| | - Baoshan Cui
- School of Environment, Beijing Normal University, Beijing, China
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Guduric V, Belton N, Richter RF, Bernhardt A, Spangenberg J, Wu C, Lode A, Gelinsky M. Tailorable Zinc-Substituted Mesoporous Bioactive Glass/Alginate-Methylcellulose Composite Bioinks. MATERIALS (BASEL, SWITZERLAND) 2021; 14:1225. [PMID: 33807758 PMCID: PMC7961332 DOI: 10.3390/ma14051225] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 02/26/2021] [Accepted: 03/03/2021] [Indexed: 12/17/2022]
Abstract
Bioactive glasses have been used for bone regeneration applications thanks to their excellent osteoconductivity, an osteostimulatory effect, and high degradation rate, releasing biologically active ions. Besides these properties, mesoporous bioactive glasses (MBG) are specific for their highly ordered mesoporous channel structure and high specific surface area, making them suitable for drug and growth factor delivery. In the present study, calcium (Ca) (15 mol%) in MBG was partially and fully substituted with zinc (Zn), known for its osteogenic and antimicrobial properties. Different MBG were synthesized, containing 0, 5, 10, or 15 mol% of Zn. Up to 7 wt.% of Zn-containing MBG could be mixed into an alginate-methylcellulose blend (algMC) while maintaining rheological properties suitable for 3D printing of scaffolds with sufficient shape fidelity. The suitability of these composites for bioprinting applications has been demonstrated with immortalized human mesenchymal stem cells. Uptake of Ca and phosphorus (P) (phosphate) ions by composite scaffolds was observed, while the released concentration of Zn2+ corresponded to the initial amount of this ion in prepared glasses, suggesting that it can be controlled at the MBG synthesis step. The study introduces a tailorable bioprintable material system suitable for bone tissue engineering applications.
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Affiliation(s)
- Vera Guduric
- Centre for Translational Bone, Joint and Soft Tissue Research, University Hospital Carl Gustav Carus and Faculty of Medicine, Technische Universität Dresden, 01307 Dresden, Germany; (V.G.); (N.B.); (R.F.R.); (A.B.); (J.S.); (A.L.)
| | - Niall Belton
- Centre for Translational Bone, Joint and Soft Tissue Research, University Hospital Carl Gustav Carus and Faculty of Medicine, Technische Universität Dresden, 01307 Dresden, Germany; (V.G.); (N.B.); (R.F.R.); (A.B.); (J.S.); (A.L.)
| | - Richard Frank Richter
- Centre for Translational Bone, Joint and Soft Tissue Research, University Hospital Carl Gustav Carus and Faculty of Medicine, Technische Universität Dresden, 01307 Dresden, Germany; (V.G.); (N.B.); (R.F.R.); (A.B.); (J.S.); (A.L.)
| | - Anne Bernhardt
- Centre for Translational Bone, Joint and Soft Tissue Research, University Hospital Carl Gustav Carus and Faculty of Medicine, Technische Universität Dresden, 01307 Dresden, Germany; (V.G.); (N.B.); (R.F.R.); (A.B.); (J.S.); (A.L.)
| | - Janina Spangenberg
- Centre for Translational Bone, Joint and Soft Tissue Research, University Hospital Carl Gustav Carus and Faculty of Medicine, Technische Universität Dresden, 01307 Dresden, Germany; (V.G.); (N.B.); (R.F.R.); (A.B.); (J.S.); (A.L.)
| | - Chengtie Wu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Dingxi Road 1295, Shanghai 200050, China;
| | - Anja Lode
- Centre for Translational Bone, Joint and Soft Tissue Research, University Hospital Carl Gustav Carus and Faculty of Medicine, Technische Universität Dresden, 01307 Dresden, Germany; (V.G.); (N.B.); (R.F.R.); (A.B.); (J.S.); (A.L.)
| | - Michael Gelinsky
- Centre for Translational Bone, Joint and Soft Tissue Research, University Hospital Carl Gustav Carus and Faculty of Medicine, Technische Universität Dresden, 01307 Dresden, Germany; (V.G.); (N.B.); (R.F.R.); (A.B.); (J.S.); (A.L.)
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Cullom AC, Martin RL, Song Y, Williams K, Williams A, Pruden A, Edwards MA. Critical Review: Propensity of Premise Plumbing Pipe Materials to Enhance or Diminish Growth of Legionella and Other Opportunistic Pathogens. Pathogens 2020; 9:E957. [PMID: 33212943 PMCID: PMC7698398 DOI: 10.3390/pathogens9110957] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 11/12/2020] [Accepted: 11/13/2020] [Indexed: 12/20/2022] Open
Abstract
Growth of Legionella pneumophila and other opportunistic pathogens (OPs) in drinking water premise plumbing poses an increasing public health concern. Premise plumbing is constructed of a variety of materials, creating complex environments that vary chemically, microbiologically, spatially, and temporally in a manner likely to influence survival and growth of OPs. Here we systematically review the literature to critically examine the varied effects of common metallic (copper, iron) and plastic (PVC, cross-linked polyethylene (PEX)) pipe materials on factors influencing OP growth in drinking water, including nutrient availability, disinfectant levels, and the composition of the broader microbiome. Plastic pipes can leach organic carbon, but demonstrate a lower disinfectant demand and fewer water chemistry interactions. Iron pipes may provide OPs with nutrients directly or indirectly, exhibiting a high disinfectant demand and potential to form scales with high surface areas suitable for biofilm colonization. While copper pipes are known for their antimicrobial properties, evidence of their efficacy for OP control is inconsistent. Under some circumstances, copper's interactions with premise plumbing water chemistry and resident microbes can encourage growth of OPs. Plumbing design, configuration, and operation can be manipulated to control such interactions and health outcomes. Influences of pipe materials on OP physiology should also be considered, including the possibility of influencing virulence and antibiotic resistance. In conclusion, all known pipe materials have a potential to either stimulate or inhibit OP growth, depending on the circumstances. This review delineates some of these circumstances and informs future research and guidance towards effective deployment of pipe materials for control of OPs.
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Affiliation(s)
- Abraham C. Cullom
- Civil and Environmental Engineering, Virginia Tech, 1145 Perry St., 418 Durham Hall, Blacksburg, VA 24061, USA; (A.C.C.); (R.L.M.); (Y.S.); (A.P.)
| | - Rebekah L. Martin
- Civil and Environmental Engineering, Virginia Tech, 1145 Perry St., 418 Durham Hall, Blacksburg, VA 24061, USA; (A.C.C.); (R.L.M.); (Y.S.); (A.P.)
- Civil and Environmental Engineering, Virginia Military Institute, Lexington, VA 24450, USA
| | - Yang Song
- Civil and Environmental Engineering, Virginia Tech, 1145 Perry St., 418 Durham Hall, Blacksburg, VA 24061, USA; (A.C.C.); (R.L.M.); (Y.S.); (A.P.)
| | | | - Amanda Williams
- c/o Marc Edwards, Civil and Environmental Engineering, Virginia Tech, 1145 Perry St., 418 Durham Hall, Blacksburg, VA 24061, USA;
| | - Amy Pruden
- Civil and Environmental Engineering, Virginia Tech, 1145 Perry St., 418 Durham Hall, Blacksburg, VA 24061, USA; (A.C.C.); (R.L.M.); (Y.S.); (A.P.)
| | - Marc A. Edwards
- Civil and Environmental Engineering, Virginia Tech, 1145 Perry St., 418 Durham Hall, Blacksburg, VA 24061, USA; (A.C.C.); (R.L.M.); (Y.S.); (A.P.)
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16
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Metal and Phosphate Ions Show Remarkable Influence on the Biomass Production and Lipid Accumulation in Oleaginous Mucor circinelloides. J Fungi (Basel) 2020; 6:jof6040260. [PMID: 33143254 PMCID: PMC7711463 DOI: 10.3390/jof6040260] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 10/24/2020] [Accepted: 10/27/2020] [Indexed: 12/23/2022] Open
Abstract
The biomass of Mucor circinelloides, a dimorphic oleaginous filamentous fungus, has a significant nutritional value and can be used for single cell oil production. Metal ions are micronutrients supporting fungal growth and metabolic activity of cellular processes. We investigated the effect of 140 different substrates, with varying amounts of metal and phosphate ions concentration, on the growth, cell chemistry, lipid accumulation, and lipid profile of M. circinelloides. A high-throughput set-up consisting of a Duetz microcultivation system coupled to Fourier transform infrared spectroscopy was utilized. Lipids were extracted by a modified Lewis method and analyzed using gas chromatography. It was observed that Mg and Zn ions were essential for the growth and metabolic activity of M. circinelloides. An increase in Fe ion concentration inhibited fungal growth, while higher concentrations of Cu, Co, and Zn ions enhanced the growth and lipid accumulation. Lack of Ca and Cu ions, as well as higher amounts of Zn and Mn ions, enhanced lipid accumulation in M. circinelloides. Generally, the fatty acid profile of M. circinelloides lipids was quite consistent, irrespective of media composition. Increasing the amount of Ca ions enhanced polyphosphates accumulation, while lack of it showed fall in polyphosphate.
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17
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Colombani N, Gervasio MP, Castaldelli G, Mastrocicco M. Soil conditioners effects on hydraulic properties, leaching processes and denitrification on a silty-clay soil. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 733:139342. [PMID: 32446080 DOI: 10.1016/j.scitotenv.2020.139342] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 05/08/2020] [Accepted: 05/08/2020] [Indexed: 06/11/2023]
Abstract
Agricultural landscapes are often affected by groundwater quality issues due to fertilizers leaching. To address this worldwide problem several agricultural best practices have been proposed, like limiting the amount of fertilizers and increasing soil organic matter content. To evaluate if these practices may promote groundwater quality enhancement, vadose zone retention time and complex biogeochemical processes must be known in detail. In this study, sequential undisturbed column experiments were performed to determine the amount of nutrients and heavy metals leached after simulated stormwater events. The column was amended with urea then flushed for two pore volumes, then straw residuals were incorporated and flushed for two pore volumes and finally compost was incorporated and flushed for six pore volumes. Dissolved ions, major gasses and heavy metals were determined in leachate samples. Nitrate and nitrite were leached in the urea treatment producing the highest concentrations, followed by compost and straw residuals. The redox conditions were aerobic in all treatments and pH was circumneutral or slightly basic. Denitrification was low but increased with the addition of straw residuals and compost. Heavy metals were all at very low concentrations except for lead and cadmium, which slightly exceeded threshold limits (10 and 1 μg/L, respectively) in all the treatments. The compost treatment, after three pore volumes, was affected by clay swelling due to sodium dispersion, which in turn provoked a reduction of porosity and hydraulic conductivity.
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Affiliation(s)
- Nicolò Colombani
- SIMAU - Department of Materials, Environmental Sciences and Urban Planning, Polytechnic University of Marche, Via Brecce Bianche 12, 60131 Ancona, Italy
| | - Maria Pia Gervasio
- DiSTABiF - Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, Campania University "Luigi Vanvitelli", Via Vivaldi 43, 81100 Caserta, Italy
| | - Giuseppe Castaldelli
- SVeB - Department of Life Sciences and Biotechnology, University of Ferrara, Via L. Borsari 46, 44121 Ferrara, Italy
| | - Micòl Mastrocicco
- DiSTABiF - Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, Campania University "Luigi Vanvitelli", Via Vivaldi 43, 81100 Caserta, Italy.
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Cockell CS, McLean CM, Perera L, Aka S, Stevens A, Dickinson AW. Growth of Non-Halophilic Bacteria in the Sodium-Magnesium-Sulfate-Chloride Ion System: Unravelling the Complexities of Ion Interactions in Terrestrial and Extraterrestrial Aqueous Environments. ASTROBIOLOGY 2020; 20:944-955. [PMID: 32434375 DOI: 10.1089/ast.2019.2092] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Motivated by an interest in understanding the habitability of aqueous environments on Earth and in extraterrestrial settings, this study investigated the influence of ions in an artificial sodium-magnesium-sulfate-chloride ion system on the growth parameters (lag phase, growth rate, and final cell concentration) of bacteria. These four ions, in different combinations, are key components of many aqueous environments on Earth and elsewhere. We investigated non-halophilic bacteria deliberately to remove the bias of prior adaptations to high concentrations of selected ions so that we could compare the effects of different ions. We tested the hypothesis that water activity determined the growth parameters independent of the ion types. Neither water activity or ionic strength alone could predict growth. However, when ionic strengths were matched, many differences in growth parameters could be explained by the water activity. We suggest that species-specific effects (caused by differences in biochemical and physiological influences), the role of individual ions in cellular processes, and potentially the chaotropicity and kosmotropicity of solutions influenced the growth. Our data show that although extreme combinations of these ions allow for general predictions on the habitability of extraterrestrial aqueous environments, a complex interplay of ionic effects influences the growth and thus the adaptations required for given ion combinations. The data also show that an accurate quantification of the habitability of ocean worlds, such as Europa and Enceladus, can only be made when samples are obtained from these water bodies and the ion combinations are determined.
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Affiliation(s)
- Charles S Cockell
- UK Centre for Astrobiology, School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
| | - Claire-Marie McLean
- UK Centre for Astrobiology, School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
| | - Liam Perera
- UK Centre for Astrobiology, School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
| | - Salomé Aka
- UK Centre for Astrobiology, School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
| | - Adam Stevens
- UK Centre for Astrobiology, School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
| | - Andrew W Dickinson
- UK Centre for Astrobiology, School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
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Mahmoud GAE, Ibrahim ABM, Mayer P. Zn(II) and Cd(II) thiosemicarbazones for stimulation/inhibition of kojic acid biosynthesis from Aspergillus flavus and the fungal defense behavior against the metal complexes' excesses. J Biol Inorg Chem 2020; 25:797-809. [PMID: 32661783 DOI: 10.1007/s00775-020-01802-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Accepted: 06/29/2020] [Indexed: 11/29/2022]
Abstract
The complexes {[ZnL1Cl] C1, [ZnL2Cl].0.5H2O C2, [CdL1Cl] C3, and [CdL2Cl] C4} were prepared from tridentate thiosemicarbazones {HL1 = 4-(3-nitrophenyl)-1-((pyridin-2-yl)methylene) thiosemicarbazide and HL2 = 4-(2,4-dimethoxyphenyl)-1-((pyridin-2-yl)methylene)thiosemicarbazide} and identified by elemental CHNS, spectroscopic {IR and UV-Vis.}, thermal and DMF solution electrical conductivity data. On another hand, kojic acid (KA) which represents important secondary metabolite with numerous hot spot applications was successfully biosynthesized from Aspergillus flavus and structurally analyzed by single crystal analysis. The Zn(II) complexes C1&C2 (0.3 mM) enhanced the KA biosynthesis by 70.87% and 42.26%, while 76.09% of C1 and 72.78% of C2 were absorbed by the fungal cells. The Cd(II) complexes C3&C4 at 0.3 mM inhibited KA production by 87.95% and 97.03% with Cd(II) consumption reaching to 40.09% & 37.3%, while 0.4 mM of C3&C4 resulted in 100% inhibition of kojic acid biosynthesis. Light microscopic analysis showed the fungal structural abnormalities and the cell antioxidant behavior was detected. These complexes could be highly applicable as new stimulators and inhibitors of kojic acid production.
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Affiliation(s)
| | - Ahmed B M Ibrahim
- Department of Chemistry, Faculty of Science, Assiut University, Assiut, 71516, Egypt
| | - Peter Mayer
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, Haus, 81377, Munich, Germany
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20
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Wang J, Lu X, Zhang J, Ouyang Y, Wei G, Xiong Y. Rice intercropping with alligator flag (Thalia dealbata): A novel model to produce safe cereal grains while remediating cadmium contaminated paddy soil. JOURNAL OF HAZARDOUS MATERIALS 2020; 394:122505. [PMID: 32200237 DOI: 10.1016/j.jhazmat.2020.122505] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 02/12/2020] [Accepted: 03/08/2020] [Indexed: 05/27/2023]
Abstract
Phytoremediation has been employed as a cost-effective technique to remove the cadmium (Cd) from soil and water in several ecosystems. However, little is known about whether intercropping the remediating plants with rice (Oryza sativa) crop could reduce Cd accumulation in rice grains. We conducted greenhouse pot and concrete pond trials to explore the effects of intercropping alligator flag (Thalia dealbata, Marantaceae) on soil Cd remediation, paddy soil and microbial properties, and rice production. Our results suggest that intercropping with alligator flag significantly decreased Cd absorption, transportation, and accumulation from the soil to the rice grains (under 0.2 mg kg-1 at a soil Cd content below 2.50 mg kg-1). This decrease was due to the lowered Cd availability and higher soil pH in the rice-alligator flag intercropping system. Although planting alligator flag resulted in the reduction of soil NH4-N and NO3-N, Cd content in the rhizosphere was the main factor restricting microbial biomass, species, and community composition. Alligator flag could tolerate higher Cd contamination, and accumulate and stabilize more Cd in its tissues than rice. Our study suggests that alligator flag intercropped with rice has potential as a phytostabilization plant to produce rice safely for human consumption in moderately Cd-contaminated soils.
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Affiliation(s)
- Jiaxin Wang
- Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Wushan Road, Tianhe District, Guangzhou, 510642, People's Republic of China
| | - Xuening Lu
- Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Wushan Road, Tianhe District, Guangzhou, 510642, People's Republic of China
| | - Jiaen Zhang
- Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Wushan Road, Tianhe District, Guangzhou, 510642, People's Republic of China; Guangdong Provincial Key Laboratory of Eco-Circular Agriculture, Guangzhou, 510642, People's Republic of China; Guangdong Engineering Research Center for Modern Eco-agriculture and Circular Agriculture, Guangzhou 510642, People's Republic of China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, People's Republic of China.
| | - Ying Ouyang
- USDA Forest Service, Center for Bottomland Hardwoods Research, 775 Stone Blvd., Thompson Hall, Room 309, Mississippi State, MS 39762, United States
| | - Guangchang Wei
- Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Wushan Road, Tianhe District, Guangzhou, 510642, People's Republic of China
| | - Yue Xiong
- Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Wushan Road, Tianhe District, Guangzhou, 510642, People's Republic of China
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MAJDOUB N, KAAB LBB, VIEIRA AI, FALEIRO ML, EL-GUENDOUZ S, MIGUEL MG. Zn treatment effects on biological potential of fennel bulbs as affected by in vitro digestion process. FOOD SCIENCE AND TECHNOLOGY 2020. [DOI: 10.1590/fst.34918] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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22
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Willetts A. Conferring the Metabolic Self-Sufficiency of the CAM Plasmid of Pseudomonas putida ATCC 17453: The Key Role of Putidaredoxin Reductase. Microorganisms 2019; 7:E395. [PMID: 31561477 PMCID: PMC6843404 DOI: 10.3390/microorganisms7100395] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 09/08/2019] [Accepted: 09/16/2019] [Indexed: 11/16/2022] Open
Abstract
The relative importance of camphor (CAM) plasmid-coded putidaredoxin reductase (PdR) and the chromosome-coded flavin reductases Frp1, Frp2 and Fred for supplying reduced FMN (FNR) to the enantiocomplementary 2,5- and 3,6-diketocamphane monooxygenases (DKCMOs) that are essential for the growth of Pseudomonas putida ATCC 17453 on (rac)-camphor was examined. By undertaking studies in the time window prior to the induction of Fred, and selectively inhibiting Frp1 and 2 with Zn2+, it was confirmed that PdR could serve as the sole active supplier of FNR to the DKCMOs. This establishes for the first time that the CAM plasmid can function as an autonomous extrachromosomal genetic element able to express all the enzymes and redox factors necessary to ensure entry of the C10 bicyclic terpene into the central pathways of metabolism via isobutyryl-CoA.
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Affiliation(s)
- Andrew Willetts
- Curnow Consultancies, Helston TR13 9PQ, UK.
- College of Life and Environmental Sciences, University of Exeter, Exeter EX4 4JG, UK.
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Gunputh UF, Le H, Besinis A, Tredwin C, Handy RD. Multilayered composite coatings of titanium dioxide nanotubes decorated with zinc oxide and hydroxyapatite nanoparticles: controlled release of Zn and antimicrobial properties against Staphylococcus aureus. Int J Nanomedicine 2019; 14:3583-3600. [PMID: 31190813 PMCID: PMC6529028 DOI: 10.2147/ijn.s199219] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2018] [Accepted: 03/21/2019] [Indexed: 12/28/2022] Open
Abstract
Purpose: This study aimed to decorate the surface of TiO2 nanotubes (TiO2 NTs) grown on medical grade Ti-6Al-4V alloy with an antimicrobial layer of nano zinc oxide particles (nZnO) and then determine if the antimicrobial properties were maintained with a final layer of nano-hydroxyapatite (HA) on the composite. Methods: The additions of nZnO were attempted at three different annealing temperatures: 350, 450 and 550 °C. Of these temperatures, 350°C provided the most uniform and nanoporous coating and was selected for antimicrobial testing. Results: The LIVE/DEAD assay showed that ZnCl2 and nZnO alone were >90% biocidal to the attached bacteria, and nZnO as a coating on the nanotubes resulted in around 70% biocidal activity. The lactate production assay agreed with the LIVE/DEAD assay. The concentrations of lactate produced by the attached bacteria on the surface of nZnO-coated TiO2 NTs and ZnO/HA-coated TiO2 NTs were 0.13±0.03 mM and 0.37±0.1 mM, respectively, which was significantly lower than that produced by the bacteria on TiO2 NTs alone, 1.09±0.30 mM (Kruskal–Wallis, P<0.05, n=6). These biochemical measurements were correlated with electron micrographs of cell morphology and cell coverage on the coatings. Conclusion: nZnO on TiO2 NTs was a stable and antimicrobial coating, and most of the biocidal properties remained in the presence of nano-HA on the coating.
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Affiliation(s)
- Urvashi F Gunputh
- School of Mechanical Engineering and Built Environment, University of Derby, Derby DE22 3AW, UK.,School of Engineering, Plymouth University, Plymouth PL4 8AA, UK
| | - Huirong Le
- School of Mechanical Engineering and Built Environment, University of Derby, Derby DE22 3AW, UK
| | | | - Christopher Tredwin
- Peninsula Schools of Medicine and Dentistry, Plymouth University, Plymouth, Devon PL6 8BU, UK
| | - Richard D Handy
- School of Biological & Marine Sciences, Plymouth University, Plymouth PL4 8AA, UK
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Zhang G, Li B, Guo F, Liu J, Luan M, Liu Y, Guan Y. Taxonomic relatedness and environmental pressure synergistically drive the primary succession of biofilm microbial communities in reclaimed wastewater distribution systems. ENVIRONMENT INTERNATIONAL 2019; 124:25-37. [PMID: 30639905 DOI: 10.1016/j.envint.2018.12.040] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 12/17/2018] [Accepted: 12/17/2018] [Indexed: 06/09/2023]
Abstract
Compared to drinking water, the higher bacterial abundance, diversity, and organic matter concentration in reclaimed wastewater suggest that it is more likely to form biofilms. Nevertheless, little is known regarding many important aspects of the biofilm ecology in reclaimed wastewater distribution systems (RWDS), such as the long-term microbial community succession and the underlying driving factors. In the present study, by sampling and analysing microbial compositions of pipe wall biofilms from six frequently used pipe materials under NaClOdisinfection (sodium hypochlorite-treated), NONdisinfection (without disinfection), and UVdisinfection (UV-treated) treatments over one year, it was found that the succession of microbial community structure followed a primary succession pattern. This primary succession pattern was reflected as increases in live cell number and α-diversity, along with metagenic succession in taxonomic composition. Proteobacteria, Nitrospirae, Bacteroidetes, Acidobacteria, Planctomycetes, Actinobacteria, and Verrucomicrobia comprised the dominant phyla in biofilm samples. Compared to biofilms in the NaClOdisinfection reactor, the bacterial communities of biofilms in NONdisinfection and UVdisinfection reactors were distributed more evenly among different bacterial phyla. Principal component analysis revealed a clear temporal pattern of microbial community structures in six kinds of pipe wall biofilms albeit a difference in microbial community structures among the three reactors. Adonis testing indicated that the microbial community composition variation caused by disinfection methods (R2 = 0.283, P < 0.01) was more pronounced than that from the time variable (R2 = 0.070, P < 0.01) and pipe material (R2 = 0.057, P < 0.01). Significantly positive correlation between average local abundance and occupancy was observed in biofilm communities of the three reactors, suggesting that the 'core-satellite' model could be applied to identify biofilm-preferential species under specific disinfection conditions in RWDS. The prevalence of family Sphingomonadaceae, known to show chlorine tolerance and powerful biofilm-forming ability in NaClOdisinfection reactors, evidenced the habitat filtering consequent to environment pressure. Correlation-based network analysis revealed that taxonomic relatedness such as similar niches, cooperation, taxa overdispersion, and competition all functioned toward driving the bacterial assembly succession in RWDS.
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Affiliation(s)
- Guijuan Zhang
- Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Graduate School at Shenzhen, Tsinghua University, Shenzhen, China; State Environmental Protection Key Laboratory of Microorganism Application and Risk Control, School of Environment, Tsinghua University, Beijing, China
| | - Bing Li
- Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Graduate School at Shenzhen, Tsinghua University, Shenzhen, China; State Environmental Protection Key Laboratory of Microorganism Application and Risk Control, School of Environment, Tsinghua University, Beijing, China.
| | - Feng Guo
- School of Life Sciences, Xiamen University, Xiamen, China
| | - Jie Liu
- Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Graduate School at Shenzhen, Tsinghua University, Shenzhen, China; State Environmental Protection Key Laboratory of Microorganism Application and Risk Control, School of Environment, Tsinghua University, Beijing, China
| | - Mingqiang Luan
- Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Graduate School at Shenzhen, Tsinghua University, Shenzhen, China; State Environmental Protection Key Laboratory of Microorganism Application and Risk Control, School of Environment, Tsinghua University, Beijing, China
| | - Yang Liu
- Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Graduate School at Shenzhen, Tsinghua University, Shenzhen, China; State Environmental Protection Key Laboratory of Microorganism Application and Risk Control, School of Environment, Tsinghua University, Beijing, China
| | - Yuntao Guan
- Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental Safety, Graduate School at Shenzhen, Tsinghua University, Shenzhen, China; State Environmental Protection Key Laboratory of Microorganism Application and Risk Control, School of Environment, Tsinghua University, Beijing, China.
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Green Synthesis of Zinc Oxide Nanoparticles by Pseudomonas aeruginosa and their Broad-Spectrum Antimicrobial Effects. JOURNAL OF PURE AND APPLIED MICROBIOLOGY 2018. [DOI: 10.22207/jpam.12.4.50] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
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26
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Environmental properties of phosphonium, imidazolium and ammonium cation-based ionic liquids as potential lubricant additives. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.10.106] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Wu Q, Huang K, Sun H, Ren H, Zhang XX, Ye L. Comparison of the impacts of zinc ions and zinc nanoparticles on nitrifying microbial community. JOURNAL OF HAZARDOUS MATERIALS 2018; 343:166-175. [PMID: 28950204 DOI: 10.1016/j.jhazmat.2017.09.022] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2017] [Revised: 09/11/2017] [Accepted: 09/12/2017] [Indexed: 06/07/2023]
Abstract
To understand the effects of metal ions and nanoparticles (NPs) on nitrifying bacterial communities, this study investigates the impacts of zinc (Zn) NPs, zinc oxide (ZnO) NPs and Zn ions on the nitrifying bacterial communities. Under low Zn concentration (0.1mgL-1), the nitrification rate was promoted by Zn ions and inhibited by the two NPs, indicating that the toxicity of NPs was caused by the NPs themselves instead of the released Zn ions. Further analysis showed that both Zn NPs and ZnO NPs could result in substantial reactive oxygen species (ROS) production in the nitrifying bacteria community. The inhibition was strongly correlated with amoA gene expression, but not with the expression of hao and nxrA genes. These results indicated that the main difference of the Zn ions and Zn NPs on nitrifying bacterial community could be due to the different impacts on the ROS production and amoA gene expression. Collectively, the findings in this study advanced understanding of the different effects of Zn NPs, ZnO NPs and Zn ions on nitrifying bacteria.
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Affiliation(s)
- Qiang Wu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Kailong Huang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Haohao Sun
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Hongqiang Ren
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Xu-Xiang Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
| | - Lin Ye
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
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28
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Decay of the water reed Phragmites communis caused by the white-rot fungus Phlebia tremellosa and the influence of some environmental factors. Appl Microbiol Biotechnol 2017; 102:345-354. [DOI: 10.1007/s00253-017-8582-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Revised: 09/22/2017] [Accepted: 10/04/2017] [Indexed: 11/26/2022]
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29
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Koushesh Saba M, Amini R. Nano-ZnO/carboxymethyl cellulose-based active coating impact on ready-to-use pomegranate during cold storage. Food Chem 2017; 232:721-726. [DOI: 10.1016/j.foodchem.2017.04.076] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2016] [Revised: 04/12/2017] [Accepted: 04/12/2017] [Indexed: 11/16/2022]
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30
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Cheong MY, Hassan HA, Ismail R, Hasan ZAA. RETRACTED: Preparation and characterization of zinc glycerolate: UV protection, biological activity and permeation study. JOURNAL OF SAUDI CHEMICAL SOCIETY 2017. [DOI: 10.1016/j.jscs.2015.09.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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31
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Podporska-Carroll J, Myles A, Quilty B, McCormack DE, Fagan R, Hinder SJ, Dionysiou DD, Pillai SC. Antibacterial properties of F-doped ZnO visible light photocatalyst. JOURNAL OF HAZARDOUS MATERIALS 2017; 324:39-47. [PMID: 26782784 DOI: 10.1016/j.jhazmat.2015.12.038] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Revised: 12/04/2015] [Accepted: 12/20/2015] [Indexed: 05/14/2023]
Abstract
Nanocrystalline ZnO photocatalysts were prepared by a sol-gel method and modified with fluorine to improve their photocatalytic anti-bacterial activity in visible light. Pathogenic bacteria such as Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive) were employed to evaluate the antimicrobial properties of synthesized materials. The interaction with biological systems was assessed by analysis of the antibacterial properties of bacteria suspended in 2% (w/w) powder solutions. The F-doping was found to be effective against S. aureus (99.99% antibacterial activity) and E. coli (99.87% antibacterial activity) when irradiated with visible light. Production of reactive oxygen species is one of the major factors that negatively impact bacterial growth. In addition, the nanosize of the ZnO particles can also be toxic to microorganisms. The small size and high surface-to-volume ratio of the ZnO nanoparticles are believed to play a role in enhancing antimicrobial activity.
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Affiliation(s)
- Joanna Podporska-Carroll
- Center for Research in Engineering Surface Technology (CREST), DIT FOCAS Institute, Kevin St., Dublin, Ireland.
| | - Adam Myles
- Center for Research in Engineering Surface Technology (CREST), DIT FOCAS Institute, Kevin St., Dublin, Ireland; School of Chemical and Pharmaceutical Sciences, Dublin Institute of Technology, Kevin St., Dublin, Ireland
| | - Brid Quilty
- School of Biotechnology, Dublin City University, Dublin, Ireland
| | - Declan E McCormack
- Center for Research in Engineering Surface Technology (CREST), DIT FOCAS Institute, Kevin St., Dublin, Ireland; School of Chemical and Pharmaceutical Sciences, Dublin Institute of Technology, Kevin St., Dublin, Ireland
| | - Rachel Fagan
- Center for Research in Engineering Surface Technology (CREST), DIT FOCAS Institute, Kevin St., Dublin, Ireland; School of Chemical and Pharmaceutical Sciences, Dublin Institute of Technology, Kevin St., Dublin, Ireland
| | - Steven J Hinder
- The Surface Analysis Laboratory, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
| | - Dionysios D Dionysiou
- Environmental Engineering and Science Program, Department of Biomedical, Chemical and Environmental Engineering (DBCEE), 705 Engineering Research Center, University of Cincinnati, Cincinnati, OH 45221-0012, USA.
| | - Suresh C Pillai
- Center for Research in Engineering Surface Technology (CREST), DIT FOCAS Institute, Kevin St., Dublin, Ireland; Nanotechnology Research Group, Department of Environmental Science, PEM Centre, Institute of Technology Sligo, Sligo, Ireland.
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32
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Al-Saleh E, Hassan A. Enhanced crude oil biodegradation in soil via biostimulation. INTERNATIONAL JOURNAL OF PHYTOREMEDIATION 2016; 18:822-831. [PMID: 26854134 DOI: 10.1080/15226514.2016.1146223] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Research on feasible methods for the enhancement of bioremediation in soil contaminated by crude oil is vital in oil-exporting countries such as Kuwait, where crude oil is a major pollutant and the environment is hostile to biodegradation. This study investigated the possibility of enhancing crude oil bioremediation by supplementing soil with cost-effective organic materials derived from two widespread locally grown trees, Conocarpus and Tamarix. Amendments in soils increased the counts of soil microbiota by up to 98% and enhanced their activity by up to 95.5%. The increase in the biodegradation of crude oil (75%) and high levels of alkB expression substantiated the efficiency of the proposed amendment technology for the bioremediation of hydrocarbon-contaminated sites. The identification of crude-oil-degrading bacteria revealed the dominance of the genus Microbacterium (39.6%), Sphingopyxis soli (19.3%), and Bordetella petrii (19.6%) in unamended, Conocarpus-amended, and Tamarix-amended contaminated soils, respectively. Although soil amendments favored the growth of Gram-negative bacteria and reduced bacterial diversity, the structures of bacterial communities were not significantly altered.
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Affiliation(s)
- Esmaeil Al-Saleh
- a Department of Biological Sciences , College of Science, Kuwait University , Kuwait
| | - Ali Hassan
- a Department of Biological Sciences , College of Science, Kuwait University , Kuwait
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33
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Chatelain M, Gasparini J, Frantz A. Trace metals, melanin-based pigmentation and their interaction influence immune parameters in feral pigeons (Columba livia). ECOTOXICOLOGY (LONDON, ENGLAND) 2016; 25:521-529. [PMID: 26809976 DOI: 10.1007/s10646-016-1610-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 01/13/2016] [Indexed: 06/05/2023]
Abstract
Understanding the effects of trace metals emitted by anthropogenic activities on wildlife is of great concern in urban ecology; yet, information on how they affect individuals, populations, communities and ecosystems remains scarce. In particular, trace metals may impact survival by altering the immune system response to parasites. Plumage melanin is assumed to influence the effects of trace metals on immunity owing to its ability to bind metal ions in feathers and its synthesis being coded by a pleiotropic gene. We thus hypothesized that trace metal exposure would interact with plumage colouration in shaping immune response. We experimentally investigated the interactive effect between exposure to an environmentally relevant range of zinc and/or lead and melanin-based plumage colouration on components of the immune system in feral pigeons (Columba livia). We found that zinc increased anti-keyhole limpet hemocyanin (KLH) IgY primary response maintenance, buffered the negative effect of lead on anti-KLH IgY secondary response maintenance and tended to increase T-cell mediated phytohaemagglutinin (PHA) skin response. Lead decreased the peak of the anti-KLH IgY secondary response. In addition, pheomelanic pigeons exhibited a higher secondary anti-KLH IgY response than did eumelanic ones. Finally, T-cell mediated PHA skin response decreased with increasing plumage eumelanin level of birds exposed to lead. Neither treatments nor plumage colouration correlated with endoparasite intensity. Overall, our study points out the effects of trace metals on some parameters of birds' immunity, independently from other confounding urbanization factors, and underlines the need to investigate their impacts on other life history traits and their consequences in the ecology and evolution of host-parasite interactions.
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Affiliation(s)
- M Chatelain
- Sorbonne Universités, UPMC Univ Paris 06, UPEC, Paris 7, CNRS, INRA, IRD, Institut d'Ecologie et des Sciences de l'Environnement de Paris, 75005, Paris, France.
| | - J Gasparini
- Sorbonne Universités, UPMC Univ Paris 06, UPEC, Paris 7, CNRS, INRA, IRD, Institut d'Ecologie et des Sciences de l'Environnement de Paris, 75005, Paris, France
| | - A Frantz
- Sorbonne Universités, UPMC Univ Paris 06, UPEC, Paris 7, CNRS, INRA, IRD, Institut d'Ecologie et des Sciences de l'Environnement de Paris, 75005, Paris, France
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Nanoparticles Composed of Zn and ZnO Inhibit Peronospora tabacina Spore Germination in vitro and P. tabacina Infectivity on Tobacco Leaves. NANOMATERIALS 2016; 6:nano6030050. [PMID: 28344307 PMCID: PMC5302510 DOI: 10.3390/nano6030050] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Revised: 03/10/2016] [Accepted: 03/11/2016] [Indexed: 01/13/2023]
Abstract
Manufactured nanoparticles (NPs) are increasingly being used for commercial purposes and certain NP types have been shown to have broad spectrum antibacterial activity. In contrast, their activities against fungi and fungi-like oomycetes are less studied. Here, we examined the potential of two types of commercially available Zn NPs (Zn NPs and ZnO NPs) to inhibit spore germination and infectivity on tobacco leaves resulting from exposure to the fungi-like oomycete pathogen Peronospora tabacina (P. tabacina). Both types of NPs, as well as ZnCl2 and bulk ZnO control treatments, inhibited spore germination compared to a blank control. ZnO ENMs were shown to be a much more powerful suppressor of spore germination and infectivity than bulk ZnO. ZnO and Zn NPs significantly inhibited leaf infection at 8 and 10 mg·L−1, respectively. Both types of NPs were found to provide substantially higher concentration dependent inhibition of spore germination and infectivity than could be readily explained by the presence of dissolved Zn. These results suggest that both NP types have potential for use as economic, low-dose, potentially non-persistent anti-microbial agents against the oomycete P. tabacina.
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Romero-Gil V, Rejano-Zapata L, Garrido-Fernández A, Arroyo-López FN. Effect of zinc formulations, sodium chloride, and hydroxytyrosol on the growth/no-growth boundaries of table olive related yeasts. Food Microbiol 2016; 57:71-80. [PMID: 27052704 DOI: 10.1016/j.fm.2016.01.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Revised: 12/02/2015] [Accepted: 01/22/2016] [Indexed: 11/19/2022]
Abstract
This study uses a mathematical approach to assessing the inhibitory effect of Zn(2)(+)(0-10 mM, obtained from ZnCl2 and ZnSO4) in presence of NaCl (0-8%) and hydroxytyrosol (0-2588 mg/L), on a yeast cocktail formed by species Pichia galeiformis, Pichia kudriavzevii, Pichia manshurica and Candida thaimueangensis obtained from spoilt green olive packages. The logistic/probabilistic models were built in laboratory medium using a total of 1980 responses (1188 for NaCl and 792 for hydroxytyrosol). ZnCl2 showed significantly higher inhibitory effect than ZnSO4 in the presence of both NaCl (p < 0.033) and hydroxytyrosol (p < 0.009). NaCl did not interfere the effect of Zn(2)(+)while hydroxytyrosol, at high levels, had a slight antagonistic effect. According to models, Zn(2)(+)inhibits (p = 0.01) the yeast cocktail in the range 4.5-5.0 mM for ZnCl2, or 8.5-9.5 mM for ZnSO4. Therefore, this work confirms the fungicidal activity of zinc compounds (mainly ZnCl2) in synthetic medium, and also shows that the loss of zinc effectiveness in real green Spanish-style olive packaging is not due to the presence of NaCl or hydroxytyrosol, two of the most abundant chemical compounds in the product.
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Affiliation(s)
- V Romero-Gil
- Food Biotechnology Department, Instituto de la Grasa (Agencia Estatal Consejo Superior de Investigaciones Científicas, CSIC), Campus Universitario Pablo de Olavide, Building 46, Ctra. Utrera, km 1, 41013 Seville, Spain
| | - L Rejano-Zapata
- AgroSevilla SCA, Paseo de Castellmadama s/n, 41590 La Roda de Andalucia, Seville, Spain
| | - A Garrido-Fernández
- Food Biotechnology Department, Instituto de la Grasa (Agencia Estatal Consejo Superior de Investigaciones Científicas, CSIC), Campus Universitario Pablo de Olavide, Building 46, Ctra. Utrera, km 1, 41013 Seville, Spain
| | - F N Arroyo-López
- Food Biotechnology Department, Instituto de la Grasa (Agencia Estatal Consejo Superior de Investigaciones Científicas, CSIC), Campus Universitario Pablo de Olavide, Building 46, Ctra. Utrera, km 1, 41013 Seville, Spain.
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Mulyono N, Kleopas Sugih A. ACTIVE BIOPACKAGING FROM DAMMAR FOR COMMINUTED MEAT PRESERVATION. JURNAL TEKNOLOGI DAN INDUSTRI PANGAN 2015. [DOI: 10.6066/jtip.2015.26.1.26] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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37
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Li L, Fernández-Cruz ML, Connolly M, Conde E, Fernández M, Schuster M, Navas JM. The potentiation effect makes the difference: non-toxic concentrations of ZnO nanoparticles enhance Cu nanoparticle toxicity in vitro. THE SCIENCE OF THE TOTAL ENVIRONMENT 2015; 505:253-260. [PMID: 25461026 DOI: 10.1016/j.scitotenv.2014.10.020] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Revised: 09/17/2014] [Accepted: 10/06/2014] [Indexed: 06/04/2023]
Abstract
Here we examined whether the addition of a non-toxic concentration (6.25 μg/mL) of zinc oxide nanoparticles (ZnONPs: 19, 35 and 57 nm, respectively) modulates the cytotoxicity of copper nanoparticles (CuNPs, 63 nm in size) in the human hepatoma cell line HepG2. The cytotoxic effect of CuNPs on HepG2 cells was markedly enhanced by the ZnONPs, the largest ZnONPs causing the highest increase in toxicity. However, CuNPs cytotoxicity was not affected by co-incubation with medium containing only zinc ions, indicating the increase in toxicity might be attributed to the particle form of ZnONPs. Transmission electron microscopy (TEM) revealed the presence of CuNPs and ZnONPs inside the cells co-exposed to both types of NP and outflow of cytoplasm through the damaged cell membrane. Inductively coupled plasma mass spectrometry (ICP-MS) determined an increase in the concentration of zinc and a decrease in that of copper in co-exposed cells. On the basis of these results, we propose that accumulation of large numbers of ZnONPs in the cells alters cellular membranes and the cytotoxicity of CuNPs is increased.
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Affiliation(s)
- Lingxiangyu Li
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - María Luisa Fernández-Cruz
- Departamento de Medio Ambiente, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Madrid 28040, Spain
| | - Mona Connolly
- Departamento de Medio Ambiente, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Madrid 28040, Spain
| | - Estefanía Conde
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Madrid 28040, Spain
| | - Marta Fernández
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Madrid 28040, Spain
| | - Michael Schuster
- Department of Chemistry, Technische Universität München, Garching 85747, Germany
| | - José María Navas
- Departamento de Medio Ambiente, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Madrid 28040, Spain.
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Calçada EO, Korsak M, Kozyreva T. Recombinant Intrinsically Disordered Proteins for NMR: Tips and Tricks. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2015; 870:187-213. [PMID: 26387103 DOI: 10.1007/978-3-319-20164-1_6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The growing recognition of the several roles that intrinsically disordered proteins play in biology places an increasing importance on protein sample availability to allow the characterization of their structural and dynamic properties. The sample preparation is therefore the limiting step to allow any biophysical method being able to characterize the properties of an intrinsically disordered protein and to clarify the links between these properties and the associated biological functions. An increasing array of tools has been recruited to help prepare and characterize the structural and dynamic properties of disordered proteins. This chapter describes their sample preparation, covering the most common drawbacks/barriers usually found working in the laboratory bench. We want this chapter to be the bedside book of any scientist interested in preparing intrinsically disordered protein samples for further biophysical analysis.
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Affiliation(s)
- Eduardo O Calçada
- Magnetic Resonance Center (CERM), University of Florence, Via Luigi Sacconi 6, 50019, Sesto Fiorentino, Italy.
| | - Magdalena Korsak
- Giotto Biotech, Via Madonna del Piano 6, 50019, Sesto Fiorentino, Italy.
| | - Tatiana Kozyreva
- Giotto Biotech, Via Madonna del Piano 6, 50019, Sesto Fiorentino, Italy.
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Juneidi I, Hayyan M, Hashim MA. Evaluation of toxicity and biodegradability for cholinium-based deep eutectic solvents. RSC Adv 2015. [DOI: 10.1039/c5ra12425e] [Citation(s) in RCA: 123] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The first study investigating the toxicity of cholinium-based DESs on freshwater fish or fungi and the biodegradability of EAC-based DESs.
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Affiliation(s)
- Ibrahim Juneidi
- Department of Chemical Engineering
- University of Malaya
- Kuala Lumpur 50603
- Malaysia
- University of Malaya Centre for Ionic Liquids (UMCiL)
| | - Maan Hayyan
- University of Malaya Centre for Ionic Liquids (UMCiL)
- University of Malaya
- Kuala Lumpur 50603
- Malaysia
- Department of Civil Engineering
| | - Mohd Ali Hashim
- Department of Chemical Engineering
- University of Malaya
- Kuala Lumpur 50603
- Malaysia
- University of Malaya Centre for Ionic Liquids (UMCiL)
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Fradler KR, Michie I, Dinsdale RM, Guwy AJ, Premier GC. Augmenting Microbial Fuel Cell power by coupling with Supported Liquid Membrane permeation for zinc recovery. WATER RESEARCH 2014; 55:115-125. [PMID: 24602866 DOI: 10.1016/j.watres.2014.02.026] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2013] [Revised: 02/06/2014] [Accepted: 02/08/2014] [Indexed: 06/03/2023]
Abstract
Simultaneous removal of organic and zinc contamination in parallel effluent streams using a Microbial Fuel Cell (MFC) would deliver a means of reducing environmental pollution whilst also recovering energy. A Microbial Fuel Cell system has been integrated with Supported Liquid Membrane (SLM) technology to simultaneously treat organic- and heavy metal containing wastewaters. The MFC anode was fed with synthetic wastewater containing 10 mM acetate, the MFC cathode chambers were fed with 400 mg L(-1) Zn(2+) and this then acted as a feed phase for SLM extraction. The MFC/SLM combination produces a synergistic effect which enhances the power performance of the MFC significantly; 0.233 mW compared to 0.094 mW in the control. It is shown that the 165 ± 7 mV difference between the MFC/SLM system and the MFC control is attributable to the lower cathode pH in the integrated system experiment, the consequent lower activation overpotential and higher oxygen reduction potential. The change in the substrate removal efficiency and Coulombic Efficiency (CE) compared to controls is small. Apart from the electrolyte conductivity, the conductivities of the bipolar and liquid membrane were also found to increase during operation. The diffusion coefficient of Zn(2+) through the liquid membrane in the MFC/SLM (4.26*10(-10) m(2) s(-1)) is comparable to the SLM control (5.41*10(-10) m(2) s(-1)). The system demonstrates that within 72 h, 93 ± 4% of the zinc ions are removed from the feed phase, hence the Zn(2+) removal rate is not significantly affected and is comparable to the SLM control (96 ± 1%), while MFC power output is significantly increased.
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Affiliation(s)
- Katrin R Fradler
- Sustainable Environment Research Centre (SERC), Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd, Mid-Glamorgan CF37 1DL, UK
| | - Iain Michie
- Sustainable Environment Research Centre (SERC), Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd, Mid-Glamorgan CF37 1DL, UK
| | - Richard M Dinsdale
- Sustainable Environment Research Centre (SERC), Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd, Mid-Glamorgan CF37 1DL, UK
| | - Alan J Guwy
- Sustainable Environment Research Centre (SERC), Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd, Mid-Glamorgan CF37 1DL, UK
| | - Giuliano C Premier
- Sustainable Environment Research Centre (SERC), Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd, Mid-Glamorgan CF37 1DL, UK.
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Identification of opsA, a gene involved in solute stress mitigation and survival in soil, in the polycyclic aromatic hydrocarbon-degrading bacterium Novosphingobium sp. strain LH128. Appl Environ Microbiol 2014; 80:3350-61. [PMID: 24657861 DOI: 10.1128/aem.00306-14] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The aim of this study was to identify genes involved in solute and matric stress mitigation in the polycyclic aromatic hydrocarbon (PAH)-degrading Novosphingobium sp. strain LH128. The genes were identified using plasposon mutagenesis and by selection of mutants that showed impaired growth in a medium containing 450 mM NaCl as a solute stress or 10% (wt/vol) polyethylene glycol (PEG) 6000 as a matric stress. Eleven and 14 mutants showed growth impairment when exposed to solute and matric stresses, respectively. The disrupted sequences were mapped on a draft genome sequence of strain LH128, and the corresponding gene functions were predicted. None of them were shared between solute and matric stress-impacted mutants. One NaCl-affected mutant (i.e., NA7E1) with a disruption in a gene encoding a putative outer membrane protein (OpsA) was susceptible to lower NaCl concentrations than the other mutants. The growth of NA7E1 was impacted by other ions and nonionic solutes and by sodium dodecyl sulfate (SDS), suggesting that opsA is involved in osmotic stress mitigation and/or outer membrane stability in strain LH128. NA7E1 was also the only mutant that showed reduced growth and less-efficient phenanthrene degradation in soil compared to the wild type. Moreover, the survival of NA7E1 in soil decreased significantly when the moisture content was decreased but was unaffected when soluble solutes from sandy soil were removed by washing. opsA appears to be important for the survival of strain LH128 in soil, especially in the case of reduced moisture content, probably by mitigating the effects of solute stress and retaining membrane stability.
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Gasparini J, Jacquin L, Laroucau K, Vorimore F, Aubry E, Castrec-Rouëlle M, Frantz A. Relationships between metals exposure and epidemiological parameters of two pathogens in urban pigeons. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2014; 92:208-212. [PMID: 24322059 DOI: 10.1007/s00128-013-1172-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Accepted: 11/28/2013] [Indexed: 06/03/2023]
Abstract
Human activities often generate or increase concentration of chemical compounds including pesticides, hydrocarbons and metals that can potentially affect ecological interactions. We found that elevated levels of zinc in pigeon feathers were associated with both low prevalence of Chlamydiaceae (ornithosis disease) and low intensity of blood pathogens (Haemosporidian parasites). In contrast, high levels of lead in pigeon feathers were associated with high blood pathogens intensities. Our results suggest that metals linked to human activities in cities such as zinc and lead may play a significant role in the ecology of host-parasite interactions and could potentially affect the epidemiology of diseases in the urban environment.
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Affiliation(s)
- J Gasparini
- Laboratoire Ecologie et Evolution (EcoEvo) UMR 7625, CNRS, 75005, Paris, France,
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Santimano MC, Kowshik M. Altered growth and enzyme expression profile of ZnO nanoparticles exposed non-target environmentally beneficial bacteria. ENVIRONMENTAL MONITORING AND ASSESSMENT 2013; 185:7205-7214. [PMID: 23341058 DOI: 10.1007/s10661-013-3094-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Accepted: 01/14/2013] [Indexed: 06/01/2023]
Abstract
The extensive production and usage of nanoparticles with ultimate disposal in the environment leads to unintentional exposure of non-target environmentally beneficial bacteria thereby posing a serious threat to the native soil inhabitants. Soil microflora is an important link in the biogeochemical cycling of nutrients, affecting ecosystem functioning and productivity. This study evaluates the effect of one of the widely used nanoparticles, zinc oxide on two predominant soil bacteria, Gram-positive Bacillus subtilis and Gram-negative Pseudomonas aeruginosa with respect to their biocatalytic activities. Growth profiles of these bacteria in the presence of zinc oxide nanoparticles (ZnONPs) at a concentration of 20 ppm exhibited a prolonged lag phase in B. subtilis, whereas no significant effect was observed in the case of P. aeruginosa even at 200 ppm. Interestingly, the enzymatic profile of both the organisms was affected at non-lethal ZnONPs concentrations. The most pronounced effect was on the enzymes associated with amylolytic activity, denitrification and urea degradation wherein total inhibition of activity was noted in B. subtilis. The enzyme activities were lowered in the case of P. aeruginosa. The results presented here reiterate a critical need for exposure assessment and risk characterization of nanomaterial disposal on soil microflora while formalizing waste management strategies.
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Affiliation(s)
- Maria Celisa Santimano
- Department of Biological Sciences, Birla Institute of Technology & Science Pilani, KK Birla Goa Campus, Zuarinagar, Goa 403726, India
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Hudek L, Pearson LA, Michalczyk A, Neilan BA, Ackland ML. Molecular and cellular characterisation of the zinc uptake (Znu) system ofNostoc punctiforme. FEMS Microbiol Ecol 2013; 86:149-71. [DOI: 10.1111/1574-6941.12153] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2013] [Revised: 05/17/2013] [Accepted: 05/17/2013] [Indexed: 12/29/2022] Open
Affiliation(s)
- Lee Hudek
- Centre for Cellular and Molecular Biology; School of Life and Environmental Sciences; Deakin University; Burwood; Vic.; Australia
| | - Leanne A. Pearson
- School of Biotechnology and Biomolecular Sciences; University of New South Wales; Sydney; NSW; Australia
| | - Agnes Michalczyk
- Centre for Cellular and Molecular Biology; School of Life and Environmental Sciences; Deakin University; Burwood; Vic.; Australia
| | - Brett A. Neilan
- School of Biotechnology and Biomolecular Sciences; University of New South Wales; Sydney; NSW; Australia
| | - M. Leigh Ackland
- Centre for Cellular and Molecular Biology; School of Life and Environmental Sciences; Deakin University; Burwood; Vic.; Australia
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Evidence for zinc and cadmium binding in a CDF transporter lacking the cytoplasmic domain. FEBS Lett 2012; 586:4332-8. [PMID: 23127559 DOI: 10.1016/j.febslet.2012.10.043] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2012] [Revised: 10/23/2012] [Accepted: 10/23/2012] [Indexed: 11/22/2022]
Abstract
Cation diffusion facilitators (CDFs) have been described as requiring the C-terminal cytoplasmic domain for their function. With the identification of smaller proteins lacking the cytoplasmic portion but displaying sequential characteristics of CDFs, this assumption should be reconsidered. Here we describe the results showing that the MmCDF3, a 23-kDa protein lacking a C-terminal domain, interacts selectively with zinc and cadmium. Isothermal titration calorimetry (ITC) binding results indicate that the truncated CDF may have an alternative means of acquiring ions from the cytoplasm in the form of an extended N-terminus, a feature common to putative cation efflux proteins of a similar size.
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Factors influencing the microbial composition of metalworking fluids and potential implications for machine operator's lung. Appl Environ Microbiol 2011; 78:34-41. [PMID: 22057869 DOI: 10.1128/aem.06230-11] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Hypersensitivity pneumonitis, also known as "machine operator's lung" (MOL), has been related to microorganisms growing in metalworking fluids (MWFs), especially Mycobacterium immunogenum. We aimed to (i) describe the microbiological contamination of MWFs and (ii) look for chemical, physical, and environmental parameters associated with variations in microbiological profiles. We microbiologically analyzed 180 MWF samples from nonautomotive plants (e.g., screw-machining or metal-cutting plants) in the Franche-Comté region in eastern France and 165 samples from three French automotive plants in which cases of MOL had been proven. Our results revealed two types of microbial biomes: the first was from the nonautomotive industry, showed predominantly Gram-negative rods (GNR), and was associated with a low risk of MOL, and the second came from the automotive industry that was affected by cases of MOL and showed predominantly Gram-positive rods (GPR). Traces of M. immunogenum were sporadically detected in the first type, while it was highly prevalent in the automotive sector, with up to 38% of samples testing positive. The use of chromium, nickel, or iron was associated with growth of Gram-negative rods; conversely, growth of Gram-positive rods was associated with the absence of these metals. Synthetic MWFs were more frequently sterile than emulsions. Vegetable oil-based emulsions were associated with GNR, while mineral ones were associated with GPR. Our results suggest that metal types and the nature of MWF play a part in MWF contamination, and this work shall be followed by further in vitro simulation experiments on the kinetics of microbial populations, focusing on the phenomena of inhibition and synergy.
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Velmurugan P, Shim J, You Y, Choi S, Kamala-Kannan S, Lee KJ, Kim HJ, Oh BT. Removal of zinc by live, dead, and dried biomass of Fusarium spp. isolated from the abandoned-metal mine in South Korea and its perspective of producing nanocrystals. JOURNAL OF HAZARDOUS MATERIALS 2010; 182:317-324. [PMID: 20599320 DOI: 10.1016/j.jhazmat.2010.06.032] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2010] [Revised: 06/02/2010] [Accepted: 06/07/2010] [Indexed: 05/29/2023]
Abstract
Bioremediation is an innovative and alternative technology to remove heavy metal pollutants from aqueous solution using biomass from various microorganisms like algae, fungi and bacteria. In this study biosorption of zinc onto live, dead and dried biomass of Fusarium spp. was investigated as a function of initial zinc(II) concentration, pH, temperature, agitation and inoculum volume. It was observed that dried, dead and live biomass efficiently removed zinc at 60 min at an initial pH of 6.0+/-0.3. Temperature of 40 degrees C was optimum at agitation speed of 150 or 200 rpm. The initial metal concentration (10-320 mg L(-1)) significantly influenced the biosorption of the fungi. Overall, biosorption was high with 30-60% by dried, live and dead biomass. In addition to this, the potential of Fusarium spp. to produce zinc nanocrystals was determined by transmission electron microscopy, energy-dispersive spectroscopy, X-ray diffraction and fourier transform infrared spectroscopy, which showed that dead biomass was not significantly involved in production of zinc nanocrystals.
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Affiliation(s)
- Palanivel Velmurugan
- Division of Biotechnology, Advanced institute of Environment and Bioscience, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan, Jeonbuk 570-752, South Korea
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Nieto JJ, Ventosa A, Ruiz-Berraquero F. Susceptibility of halobacteria to heavy metals. Appl Environ Microbiol 2010; 53:1199-202. [PMID: 16347350 PMCID: PMC203836 DOI: 10.1128/aem.53.5.1199-1202.1987] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Sixty-eight halobacteria, including both culture collection strains and fresh isolates from widely differing geographical areas, were tested for susceptibility to arsenate, cadmium, chromium, cobalt, copper, lead, mercury, nickel, silver, and zinc ions by an agar dilution technique. The culture collection strains showed different susceptibilities, clustering into five groups. Halobacterium mediterranei and Halobacterium volcanii were the most metal tolerant, whereas Haloarcula californiae and Haloarcula sinaiiensis had the highest susceptibilities of the culture collection strains. Different patterns of metal susceptibility were found for all the halobacteria tested, and there was a uniform susceptibility to mercury and silver. All strains tested were multiply metal tolerant.
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Affiliation(s)
- J J Nieto
- Department of Microbiology, Faculty of Pharmacy, University of Seville, Seville, Spain
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Weichold O, Goel P, Lehmann KH, Möller M. Solvent-crazed PET fibers imparting antibacterial activity by release of Zn2+. J Appl Polym Sci 2009. [DOI: 10.1002/app.29818] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Protective capacities of cell surface-associated proteins of Streptococcus suis mutants deficient in divalent cation-uptake regulators. Microbiology (Reading) 2009; 155:1580-1587. [DOI: 10.1099/mic.0.026278-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Many cell surface-associated, divalent cation-regulated proteins are immunogenic, and some of them confer protection against the bacterial species from which they are derived. In this work, two Streptococcus suis divalent cation uptake regulator genes controlling zinc/manganese and iron uptake (adcR and fur, respectively) were inactivated in order to study the protective capacities of their cell surface-associated proteins. The results obtained showed overexpression of a set of immunogenic proteins (including members of the pneumococcal histidine triad family previously reported to confer protection against streptococcal pathogens) in S. suis adcR mutant cell surface extracts. Likewise, genes encoding zinc transporters, putative virulence factors and a ribosomal protein paralogue related to zinc starvation appeared to be derepressed in this mutant strain. Moreover, protection assays in mice showed that although neither adcR- nor fur-regulated cell surface-associated proteins were sufficient to confer protection in mice, the combination of both adcR- and fur-regulated cell surface-associated proteins is able to confer significant protection (50 %, P=0.038) against a challenge to mice vaccinated with them.
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